Variable Interest Entities (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Approximate value of VIEs total assets	$ 167,500,000	$ 138,200,000
Approximate value of VIEs total liabilities	63,500,000	62,400,000
Non-recourse mortgage debt included in liabilities	45,700,000	45,700,000
Danbury and Southbury Green [Member]
Approximate value of VIEs total assets	111,200,000	109,200,000
Approximate value of VIEs total liabilities	$ 63,000,000	$ 61,900,000